公开(公告)号：US20190113491A1

公开(公告)日：2019-04-18

申请号：US16090391

申请日：2016-07-29

Applicant: HONEYWELL INTERNATIONAL INC.

Inventor： Guangli XIE ,  Bo CHEN ,  Zhanghua WU ,  Yaofu GONG

IPC: G01N33/00 ,  G01N27/66

CPC classification number: G01N33/0006 ,  G01N27/66 ,  G01N30/64 ,  G01N30/8665 ,  G01N33/0047 ,  G01N2030/642

Abstract: A method of detecting gas with a photoionization detector (PID) system. The method includes powering on a photoionization detector, turning off an ultraviolet lamp of the photoionization detector by a controller of the PID system and keeping it turned off during the zero calibration procedure, flowing ambient air from a surrounding environment by a fan of the photoionization detector system past a detector electrode of the photoionization detector, processing an output of the detector electrode by the controller to determine a zero level of the photoionization detector, and storing the zero level in a memory of the photoionization detector system. The photoionization detector system in a detecting mode compares an output of the detector electrode to the zero level to determine if a threshold concentration of a gas is present.

公开(公告)号：US20200025716A1

公开(公告)日：2020-01-23

申请号：US16471178

申请日：2016-12-20

Applicant: HONEYWELL INTERNATIONAL INC.

Inventor： Bo CHEN ,  Qidao LIN ,  Guangli XIE ,  Zhanghua WU

IPC: G01N27/66

Abstract: Embodiments relate generally to systems and methods for shielding electrodes (204,205,504,505) within a photoionization detector (100). A photoionization detector (100) may comprise an ultraviolet radiation source (130); one or more detector electrodes (204,205,504,505); one or more collection surfaces (224,225,524,525) extending vertically from the detector electrodes (204,205,504,505); and a shielding material (206,506) located between the ultraviolet radiation source (130) and the one or more detector electrodes (204,205,504,505), wherein the ultraviolet radiation (130) does not directly impinge on at least a portion of the one or more detector electrodes (204,205,504,505). The one or more collection surfaces (224,225,524,525) may comprise a surface area that is not covered by the shielding material (206,506).

公开(公告)号：US20200018639A1

公开(公告)日：2020-01-16

申请号：US16471172

申请日：2016-12-20

Applicant: HONEYWELL INTERNATIONAL INC.

Inventor： Bo CHEN ,  Yuzhong June WANG ,  Qidao LIN ,  Guangli XIE ,  Zhanghua WU

IPC: G01J1/04 ,  G01J1/42 ,  G01J1/44 ,  G01J1/08

Abstract: A photoionization detector (100) comprises an ultraviolet radiation source (130); one or more detector electrodes (204 and 205); and a shielding material (206) located between the ultraviolet radiation source (130) and the one or more detector electrodes (204 and 205), wherein the ultraviolet radiation (240) does not directly impinge on any part of the one or more detector electrodes (204 and 205). A method for gas detection comprises exposing a photoionization detector (100) to an environment containing a target gas; and shielding the one or more detector electrodes (204 and 205) from direct impingement from the ultraviolet radiation (240) via the shielding material (206).

公开(公告)号：US20220390424A1

公开(公告)日：2022-12-08

申请号：US17820608

申请日：2022-08-18

Applicant: Honeywell International Inc.

Inventor： Guangli Xie ,  Bo CHEN ,  Zhanghua WU ,  Yaofu GONG

IPC: G01N33/00 ,  G01N27/66 ,  G01N30/64

Abstract: A method of detecting gas includes determining and storing, by a controller, a zero level of a photoionization detector using ambient air inflow when an ultraviolet lamp is in a turned OFF state, wherein the stored zero level is based on an ambient temperature; sampling, by the controller, an output of a detector electrode of the photoionization detector when the ultraviolet lamp is in a turned ON state; and comparing the sampled output of the detector electrode to the stored zero level to determine if a threshold concentration of a gas is present.

公开(公告)号：US20210181170A1

公开(公告)日：2021-06-17

申请号：US17176542

申请日：2021-02-16

Applicant: HONEYWELL INTERNATIONAL INC.

Inventor： Guangli XIE ,  Bo CHEN ,  Zhanghua WU ,  Yaofu GONG

IPC: G01N33/00 ,  G01N27/66 ,  G01N30/64

Abstract: A method of detecting gas includes determining and storing, by a controller, a zero level of a photoionization detector using ambient air inflow when an ultraviolet lamp is in a turned OFF state, wherein the stored zero level is based on an ambient temperature; sampling, by the controller, an output of a detector electrode of the photoionization detector when the ultraviolet lamp is in a turned ON state; and comparing the sampled output of the detector electrode to the stored zero level to determine if a threshold concentration of a gas is present.